${\hat{I}}^2$ Decay of ${}^{132}$In and Spectroscopy of ${}^{132}$Sn and ${}^{131}$Sb with the GRIFFIN Spectrometer

Abstract

Spectroscopy of doubly magic ${}_{50}^{132}$Sn${}_{82}$ has been performed with the GRIFFIN spectrometer at TRIUMF-ISAC following the ${\hat{I}}^2$ decay of ${}_{49}^{132}$In${}_{83}$. The analysis has allowed for the placement of a total of 70 transitions and 29 excited states in ${}^{132}$Sn. Detailed spectroscopy has also been performed on ${}^{131}$Sb, resulting from the ${\hat{I}}^2$ decay of ${}^{131}$Sn, produced from the ${\hat{I}}^2$-delayed neutron decay of ${}^{132}$In. Measurement of ${\hat{I}}^3$-rays in both ${}^{131}$Sn and ${}^{131}$Sb has led to the determination of the ${\hat{I}}^2$-delayed neutron emission probability, $P_n$, from ${}^{132}$In. This is the first time the $P_n$ has been measured for this nucleus using ${\hat{I}}^3$ spectroscopy, and the new value of 12.3(4)% is consistent with the most recent ${\hat{I}}^2-n$ counting experiment. Additionally, ${\hat{I}}^3$-${\hat{I}}^3$ angular correlations have been performed in ${}^{132}$Sn, supporting the spin assignments of several excited states. Novel ab initio calculations are presented which describe several of the excited states, and these are compared to the experimental spectrum.

14 pages, 7 figures, to be published in Physical Review C